APPLICATION NOTE Atmel AVR600: STK600 Expansion, Routing and Socket Boards Introduction Atmel Microcontrollers This application note describes the process of developing new routing, socket and expansion cards for the Atmel STK 600. It also describes the physical parameters for creating such cards. The STK600 starter kit from Atmel has a sandwich design to match a specific part package and pin out to the generic pin headers. It also features an expansion area where most part pins are available. While the variety of IC packages is relatively limited, the number of possible pinouts increases rapidly with the number of pins. I.e. a 6-pin IC can have 720 (6!) different pinouts! The routing / socket card design provides a lowcost solution to support upcoming devices as the socket is the cost driving factor. STK600 users might also want to create their own routing cards to include specialized hardware to prototype their own design. Figure 1. STK600 router and socket card.
Table of Contents 1. Routing Cards... 3 1.1 Connector footprints... 3 1.2 Physical dimensions and component placement... 4 1.3 Atmel STK600 socket connectors pinout... 5 1.3.1 Signal descriptions... 8 2. Socket Cards... 10 2.1 Power design issues... 10 2.2 Connector MPN... 10 2.3 Physical dimensions and component placement... 10 3. Expansion Cards... 11 3.1 Connector MPN... 11 3.2 Physical dimensions and component placement... 12 3.3 Atmel STK600 expansion connectors pinout... 13 4. ID System... 17 4.1 Signal usage... 17 4.2 ID functions... 18 4.3 Examples... 19 5. Design Example... 20 6. Revision History... 22 2
1. Routing Cards The routing cards sit between the generic socket card and the Atmel STK600. It has one pair of electric pads underneath to mate with the STK600 spring loaded connector, and one pair of pads on top where the socket card connector connects. A part specific card with the target IC soldered on can be viewed as a routing card without the top pads. 1.1 Connector footprints A routing card should have pads to mate with the following spring loaded connectors: Table 1-1. Router card connectors. Manufacturer and MPN Quantity Comment SAMTEC, FSI-140-03-G-D-AD 2 80-pins to socket card (top) SAMTEC, FSI-150-03-G-D-AD 2 100-pins to STK600 (bottom) Figure 1-1. PCB land pattern for mating to FSI connectors. 3
1.2 Physical dimensions and component placement Figure 1-2. Routing card connector pad placement and dimensions. Figure 1-3. Clip hole dimensions. The board thickness should be 1.6mm to be compatible with the clips. Note: Components on the main board might conflict with through hole mounted or secondary side mounted components. Areas with such components are highlighted in Figure 1-4. 4
Figure 1-4. Height restricted areas due to main board components. 1.3 Atmel STK600 socket connectors pinout Figure 1-5 shows the pinout for the STK600 headers. This corresponds to the routing card connectors J1 and J2. Figure 1-5. STK600 socket connectors pinout. 5
Table 1-2. Atmel STK600 J201 left, routing card connector J1 pinout. Signal name Pin number Signal name VTG 2 1 GND PA1 4 3 PA0 PA3 6 5 PA2 PA5 8 7 PA4 PA7 10 9 PA6 VTG 12 11 GND PB1 14 13 PB0 PB3 16 15 PB2 PB5 18 17 PB4 PB7 20 19 PB6 VTG 22 21 GND PC1 24 23 PC0 PC3 26 25 PC2 PC5 28 27 PC4 PC7 30 29 PC6 VTG 32 31 GND PD1 34 33 PD0 PD3 36 35 PD2 PD5 38 37 PD4 PD7 40 39 PD6 VTG 42 41 GND PE1 44 43 PE0 PE3 46 45 PE2 PE5 48 47 PE4 PE7 50 49 PE6 VTG 52 51 GND PF1 54 53 PF0 PF3 56 55 PF2 PF5 58 57 PF4 PF7 60 59 PF6 VTG 62 61 GND PG1 64 63 PG0 PG3 66 65 PG2 PG5 68 67 PG4 PG7 70 69 PG6 VTG 72 71 GND PH1 74 73 PH0 PH3 76 75 PH2 PH5 78 77 PH4 6
PH7 80 79 PH6 VTG 82 81 GND AREF0 84 83 XTAL1 AREF1 86 85 XTAL2 TGT_MOSI 88 87 GND TGT_MISO 90 89 TOSC1 TGT_SCK 92 91 TOSC2 TDI 94 93 TGT_RESET TDO 96 95 GND TMS 98 97 Vext TCK 100 99 Vcc Table 1-3. Atmel STK600 J202 right, routing card connector J2 pinout. Signal name Pin number Signal name VTG 2 1 GND PJ1 4 3 PJ0 PJ3 6 5 PJ2 PJ5 8 7 PJ4 PJ7 10 9 PJ6 VTG 12 11 GND PK1 14 13 PK0 PK3 16 15 PK2 PK5 18 17 PK4 PK7 20 19 PK6 VTG 22 21 GND PL1 24 23 PL0 PL3 26 25 PL2 PL5 28 27 PL4 PL7 30 29 PL6 VTG 32 31 GND PM1 34 33 PM0 PM3 36 35 PM2 PM5 38 37 PM4 PM7 40 39 PM6 VTG 42 41 GND PN1 44 43 PN0 PN3 46 45 PN2 PN5 48 47 PN4 PN7 50 49 PN6 VTG 52 51 GND PP1 54 53 PP0 7
PP3 56 55 PP2 PP5 58 57 PP4 PP7 60 59 PP6 VTG 62 61 GND PQ1 64 63 PQ0 PQ3 66 65 PQ2 PQ5 68 67 PQ4 PQ7 70 69 PQ6 VBUST 72 71 DP UVCON 74 73 DN Vcc 76 75 UID Vext 78 77 GND TGT_PDATA1 80 79 TGT_PDATA0 TGT_PDATA3 82 81 TGT_PDATA2 TGT_PDATA5 84 83 TGT_PDATA4 TGT_PDATA7 86 85 TGT_PDATA6 TGT_PCTRL1 88 87 TGT_PCTRL0 TGT_PCTRL3 90 89 TGT_PCTRL2 TGT_PCTRL5 92 91 TGT_PCTRL4 TGT_PCTRL7 94 93 TGT_PCTRL6 BOARD_ID1 96 95 BOARD_ID0 BOARD_ID3 98 97 BOARD_ID2 BOARD_ID5 100 99 BOARD_ID4 1.3.1 Signal descriptions Table 1-4. Socket card connector pin description. Atmel STK600 signal name MCU Comment PAx, PBx etc PAx, PBx etc 1-to-1 MCU pin mapping VTG Vcc Target supply rail controlled by Atmel AVR Studio / STK600 GND GND AREFx AREF Analog reference voltage, controlled by AVR Studio / STK600 XTALx XTALx Clock pins connected to oscillator on STK600 TGT_SCK, TGT_MISO, TGT_MOSI ISP pins ISP programming interface TGT_TDI, TGT_TDO, TGT_TMS, TGT_TCK JTAG pins JTAG programming interface VBUST VBUS VBUS (sense) for USB UID UID ID pin for USB OTG UVCON UVCON DP, DN DP, DN USB differential pair USB VBUS generation control for USB OTG. A low level on this signal enables VBUS generation TGT_PDATA(0-7) (HV) data pins Data pins for high voltage (PP/HVSP) programming 8
TGT_CTRL0 TGT_CTRL1 TGT_CTRL2 TGT_CTRL3 TGT_CTRL4 TGT_CTRL5 TGT_CTRL6 TGT_CTRL7 BOARD_IDn (HV) BS2 (HV) Ready/Busy (HV) /OE (HV) /WR (HV) BS1 (HV) XA0 (HV) XA1 (HV) PAGEL none Control signals for High voltage Parallel Programming / Serial Programming. Refer to AVR datasheet for further information. On AVRs with common XA1/BS2, XA1 is used. On AVRs with common BS1/PAGEL, BS1 is used. ID system for router / socket / expansion cards, see Chapter 4 - ID System Notes: 1. Not all AVR will have every pin (ex. two aref pins, tosc or usb). 2. A MCU pin will fan-out to both Pnx pin and to the programming interface(s) located at that pin. 9
2. Socket Cards Socket cards route each pin from the IC socket to separate pins on the spring loaded connectors on the bottom side, facing the routing card. 2.1 Power design issues As all routing is handled by the routing card, even power lines and power decoupling is ignored at the socket card. This produces less than ideal power design, which may lead to unwanted noise, ground bounce, and other effects. It should therefore be expected that heavily loaded designs cannot run at full speed on the Atmel STK600. Likewise, such power design is not recommended for custom designs. 2.2 Connector MPN Table 2-1. Socket card connector. Manufacturer and MPN Quantity Comment SAMTEC, FSI-140-03-G-D-AD 2 Spring loaded 80-pin connector 2.3 Physical dimensions and component placement Figure 2-1. Socket card connector placement and dimensions. 105mm 94mm 66mm Note! 45 J1 J2 ST1 7mm The board thickness should be 1.6mm to be compatible with the clips. 10
3. Expansion Cards The Atmel STK600 features an expansion area where cards for custom peripherals like memory expansion, LCD etc can be placed. STK600 routes all part pins and power to the expansion card connectors. 3.1 Connector MPN Table 3-1. Expansion card connector. Manufacturer and MPN Quantity Comment FCI, 61082-101402LF 2 11
3.2 Physical dimensions and component placement Figure 3-1. Expansion card connector placement and dimensions. There is no requirement to board thickness. 12
3.3 Atmel STK600 expansion connectors pinout Figure 3-2. Pinout for expansion connectors. Table 3-2. STK600 J301 expand0 connector pinout. Signal name Pin number Signal name VTG 2 1 GND PA1 4 3 PA0 PA3 6 5 PA2 PA5 8 7 PA4 PA7 10 9 PA6 VTG 12 11 GND PB1 14 13 PB0 PB3 16 15 PB2 PB5 18 17 PB4 PB7 20 19 PB6 VTG 22 21 GND PC1 24 23 PC0 PC3 26 25 PC2 PC5 28 27 PC4 PC7 30 29 PC6 VTG 32 31 GND PD1 34 33 PD0 13
PD3 36 35 PD2 PD5 38 37 PD4 PD7 40 39 PD6 VTG 42 41 GND PE1 44 43 PE0 PE3 46 45 PE2 PE5 48 47 PE4 PE7 50 49 PE6 VTG 52 51 GND PF1 54 53 PF0 PF3 56 55 PF2 PF5 58 57 PF4 PF7 60 59 PF6 VTG 62 61 GND PG1 64 63 PG0 PG3 66 65 PG2 PG5 68 67 PG4 PG7 70 69 PG6 VTG 72 71 GND PH1 74 73 PH0 PH3 76 75 PH2 PH5 78 77 PH4 PH7 80 79 PH6 VTG 82 81 GND AREF0 84 83 XTAL1 AREF1 86 85 XTAL2 TGT_MOSI 88 87 GND TGT_MISO 90 89 TOSC1 TGT_SCK 92 91 TOSC2 TDI 94 93 TGT_RESET TDO 96 95 Vcc6 TMS 98 97 GND TCK 100 99 Vcc6 Table 3-3. Atmel STK600 J302 expand1 connector pinout. Signal name Pin number Signal name VTG 2 1 GND PJ1 4 3 PJ0 PJ3 6 5 PJ2 PJ5 8 7 PJ4 PJ7 10 9 PJ6 14
VTG 12 11 GND PK1 14 13 PK0 PK3 16 15 PK2 PK5 18 17 PK4 PK7 20 19 PK6 VTG 22 21 GND PL1 24 23 PL0 PL3 26 25 PL2 PL5 28 27 PL4 PL7 30 29 PL6 VTG 32 31 GND PM1 34 33 PM0 PM3 36 35 PM2 PM5 38 37 PM4 PM7 40 39 PM6 VTG 42 41 GND PN1 44 43 PN0 PN3 46 45 PN2 PN5 48 47 PN4 PN7 50 49 PN6 VTG 52 51 GND PP1 54 53 PP0 PP3 56 55 PP2 PP5 58 57 PP4 PP7 60 59 PP6 VTG 62 61 GND PQ1 64 63 PQ0 PQ3 66 65 PQ2 PQ5 68 67 PQ4 PQ7 70 69 PQ6 Vext 72 71 GND Vext 74 73 GND GND 76 75 Vcc GND 78 77 Vcc TGT_PDATA1 80 79 TGT_PDATA0 TGT_PDATA3 82 81 TGT_PDATA2 TGT_PDATA5 84 83 TGT_PDATA4 TGT_PDATA7 86 85 TGT_PDATA6 TGT_PCTRL1 88 87 TGT_PCTRL0 TGT_PCTRL3 90 89 TGT_PCTRL2 TGT_PCTRL5 92 91 TGT_PCTRL4 15
TGT_PCTRL7 94 93 TGT_PCTRL6 Vcc3 96 95 GND BOARD_ID1 98 97 BOARD_ID0 BOARD_ID7 100 99 BOARD_ID6 16
4. ID System The Atmel STK600 features an ID system to identify which routing, socket and expansion card is attached. The STK600 can impose voltage limitations based on the IDs, and Atmel AVR Studio will notify the user if the combination is incorrect. The ID system consists of two common output and two board unique input signals. Each input is one of sixteen possible values based in the input signals giving a total ID space of 256. Three IDs are reserved for custom use and can be implemented without use of ICs. Table 4-1. IDs reserved for custom use. Type Board limited to 1.8V Board limited to 3.3V No limit on voltage The ID 0xff indicates no board present. ID 0xCA 0xCC 0xCF 4.1 Signal usage Table 4-2. ID system signal usage. Name Direction Function BOARD_ID0 Output (A) Common output to functions BOARD_ID1 Output (B) Common output to functions BOARD_ID2 Input Input from routing card BOARD_ID3 Input Input from routing card BOARD_ID4 Input Input from socket card BOARD_ID5 Input Input from socket card BOARD_ID6 Input Input from expansion card BOARD_ID7 Input Input from expansion card 17
4.2 ID functions The functions and their output according to input A and B: B A 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0 0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 1 0 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 Functions as logic expressions: Function Expression ID 0 0 0x0 1 A + B 0x1 2 A B 0x2 3 B 0x3 4 A B 0x4 5 A 0x5 6 A B 0x6 7 AB 0x7 8 AB 0x8 9 A B 0x9 10 A 0xA 11 B + AB 0xB 12 B 0xC 13 B + A B 0xD 14 A + B 0xE 15 1 0xF 18
4.3 Examples For a socket card to report the ID 0xCA: Route BOARD_ID1 to BOARD_ID4 and BOARD_ID0 to BOARD_ID5 Figure 4-1. Socket card ID example. For an expansion card to report the ID 0xCF: Route BOARD_ID0 to BOARD_ID6 and VCC to BOARD_ID7 Figure 4-2. Expansion card ID example. For a router card to report the ID 0xCC: Route BOARD_ID1 to both BOARD_ID2 and BOARD_ID3. Figure 4-3. Routing card ID example. 19
5. Design Example To support a new package type one would typically start with designing the socket card. The pinout between the socket card and routing card is not defined and left to the designer. An example is given in Figure 5-1. Next is the design of the routing card (Figure 5-3). The routing card s role is to connect each pin from the socket card to the corresponding pin on the Atmel STK600. In addition to decoupling etc, the routing card should also fan-out the correct signals to programming headers. Each card in the stack has its own board_id pins; the routing card is responsible for passing on the signal to the socket card. Figure 5-1. Schema capture of socket card. Both the socket and routing card must also include the clip holes: Figure 5-2. Clip holes included in schematic. 20
Figure 5-3. Schema capture of routing card. Copyright 2008, Atmel Corporation 21
6. Revision History Doc. Rev. Date Comments 8170C 03/2013 Example schematics for the ID system are updated 8170B 12/2010 8170A 10/2008 Initial document release 22
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